sort: fix issues with month sorting in some locales

* src/sort.c (char fold_toupper[]): Change to unsigned
so as the correct comparisons are made in getmonth().
This fixes unibyte locales where abbreviated months
have characters that are > 0x7F, but it also works for
multibyte locales with the caveat that multibyte characters
are matched case sensitively.
With this change, the following example sorts correctly:
  $ echo -e "1 márta\n2 Feabhra" | LANG=ga_IE.utf8 sort -k2,2M
  2 Feabhra
  1 márta
* src/sort.c (inittables): Since we ignore blanks around months
in the input, don't include them when they're present in the locale.
With this change, the following example sorts correctly:
  $ echo -e "1 2月\n2 1月" | LANG=ja_JP.utf8 sort -k2,2M
  2 1月
  1 2月
* tests/misc/sort-month: A new test to exercise the above cases.
* tests/Makefile.am: Reference the new test.
* NEWS: Mention the fix.

1 files changed, 38 insertions, 0 deletions

diff --git a/tests/misc/sort-month b/tests/misc/sort-month
new file mode 100755
index 000000000..aee5215d5
--- /dev/null
+++ b/tests/misc/sort-month
@@ -0,0 +1,38 @@
+#!/bin/sh
+# Test sorting of abbreviated months from the locale
+
+# Copyright (C) 2010 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+if test "$VERBOSE" = yes; then
+  set -x
+  sort --version
+fi
+
+. $srcdir/test-lib.sh
+
+locale --version >/dev/null 2>&1 ||
+  skip_test_ 'The locale utility is not present'
+
+# C will be used if the locale is not present
+for LOC in "$LOCALE_FR" "$LOCALE_FR_UTF8" "ja_JP.utf8"; do
+  mon="$(LC_ALL="$LOC" locale abmon 2>/dev/null);"
+  smon=$(LC_ALL="$LOC" locale abmon 2>/dev/null |
+          tr ';' '\n' | shuf | nl | LC_ALL="$LOC" sort -b -k2,2M |
+          cut -f2 | tr '\n' ';')
+  test "$mon" = "$smon" || { fail=1; break; }
+done
+
+Exit $fail